A trailer involved in a fatal crash on the Karak Expressway caught fire following an explosion during recovery operations. The initial crash resulted in four deaths. Firefighters were attempting to right the overturned vehicle when the blaze erupted. Officials have not yet determined the cause of the explosion or fire. The incident further complicated recovery efforts at the crash site near Bentong. Authorities are investigating both the original accident and the subsequent fire. The fire caused further damage to the already wrecked trailer.